Locomotive nozzle restrictor



March 25, 1930. J, KNUDSON 1,751,820

LOCOMOT IVE NOZ ZLE RESTRICTOR Filed May 23, 1927 Patented Mar. 25, 1930 JALMER xnunsoiv, or, irrnnnaioma MINNESOTA LocoMo'rIvn NozzLE lmisa?moron p Application filed May 23, 1927. Serial `l\'Ic`J.:193,544.

."This invention relates to a nozzlecontrolling' or restricting device and particularly to such a device adapted for use on locomotives. As is well known to those skilled in the art, a nozzle is used below the smokestack of a locomotive, through which the exhaust gases pass to produce the desired draft. There is not always the same amount of steam passed through the cylinders and it is quite desir- 110 able in order to properly regulate the draft on the fire, to be able to control the opening through the nozzle. 1n the control of modern locomotives, the reverse lever is usually used and when this lever is thrownto its extreme position, it is desirable to have the exhaust nozzle least restricted. It is also desirable to have a restricted nozzle when the engine is ruiming at uniform speed with the reverse lever in central position or running position, so thatV the velocity of the exhaust gases will be somewhat increased.

It is an object of this invention, therefore, to provide a very simple and convenient means by which the nozzle may be restricted x to afford the desired draft under various running conditions.

Itis another object of the invention to provide a means for restricting orv controlling the exhaust nozzle to regulate the draft,

30 which means is connected to the reverse lever of a locomotive and 1s ad]usted when the reverse lever is moved. y

It is more specifically an object of the 1nvention to provide a controlling means for 35V the exhaust nozzle of a locomotive compris.

than the diameter of said nozzle, which plate is swingably mounted adjacent the top of the nozzle to be moved into and held in various positions to more or less restrict the opening' y through the nozzle.

These and other objects and advantages of the invention will be fully set forth in the l portion of the locomotive, certain parts being ing acircular plate of much less diameter broken away to ratus; Fig. 2 is a horizontal section taken on line 2-2 of Fig. 1, as indicated by the arrows;

Fig. 3 is a vertical section takennonline l more Clearly'lshow the appa 3--3 of Fig. 2, as indicatedby the arrows; Y Y

and A Fig. 4: is a plan view'of the nozzle restricting means and the operating .shaft and gear therefor. Y

`Referring to the drawings, in Fig'. 1 part cfa locomotive'is shown, of whichlit willonly benecessary to consider the boiler 5," the stack 6,.the cabin 7 in which is disposed the reverse orfcontrol lever 8, said'leverl being moved along a quadrant or segment'9 arf ranged .tohold the same in various positions.V The valve `controlling lever 10 1s ,shownl as mounted'in the rear of the cross-head onv a bearing 11` whichis connected to the' valve operating'lever 12,'thelatter'being connected -to the valve'by the valverod 13... Thevalve controlling lever 10 is shown connected "to the lever 8 inthe usual manner by a link 14.

VThe exhaust nozzle of the locomotive is shown as z15V andthe same isprovided'with a rod 16 extendingV diametricallythereof and Vjournaled in the; sides of said nozzle. The

rod`16 carries centrallyiofrthe nozzle15a circular" plate l disposed substantially co` axial vwiththe nozzle 15. The rod 16 extends to one side Vof the `nozzle-'15 and has secured to the end thereof a pinion 18. The pinicnv 18 meshes with `a gear segment 19 mounted on a shaft20-.1journaled at one end in the lside of the'. nozzle '15 and adjacentits other end inthe boiler shell 5. The shaft 20 has an arm 21 secured thereto and a link 22 is secured tothe' end of arm 21 and extends rearwardly, being pivotall Y secured Vat its other end tolthe upper end of7 lever 10. l

In operation when the reversing or controlling lever 8 is thrown to one of its extreme positions as indicated in Fig. 1, the linkl22 will bemove-d to swing arm 21 .so that: the circular .plate 17 will be substantially inver# tical position. The nozzle will then be' the least'restricted and will have substantiallyits full..opening.e Atv this time considerable the valve controllingy steam will be admitted to the cylinders and a suiicient opening will thus be provided for this steam. The extra amount of steam Will give a suiicient velocity to the exhaust gases so that the desired draft will be produced. lvWhen the lever 8 is thrown to an intermediate position where it is usually disposed when the engine is running at uniform speed, the arm 21 will be swung and shaft 16 moved through gears 19 and 18 so that the plate 17 will be disposed more nearly in a horizontal position, thus restricting the. opening of the nozzle. The restricted opening will tend to increase the velocity of the exhaust gases from the cylinder and the desired draft will thus he obtained while the engine is running at uniform speed and with a smaller supply of steam. The plate 17 tends to spread thev steamissuing from the nozzle 15 and the steam passes `upwardly into the stack 6 substantially filling the stack. If the steam is not so spread when the steam is partially shut off at the throttle, the steam tends to pass in a central stream through the stack 6 and air is drawn down around the sides of the stack by the vacuum formed in the exhaust chamber or front end of the boiler 5. This entering `air destroys the vacuum caused by the outgoo. It will be seen that the control of the to said last mentioned means and extending to the cab of the locomotive, for operating said gear means, whereby said member may be disposed in a plane `substantially at right angles to the axis of said nozzle or in al subspread the steam passing through said nozzle, said steam being directed by said nozzle into said stack wherebysaid stack will be substantially filled with rsteam whethera greater amount or a lesser amount of steam is passing through said nozzle.

In testimony whereof I aliix my signature.

JALMER KNUDSON.

lowsv the movements of the lever 8.

. n. From the abovedescription it is seen that applicant has provided a very vsimple and efficient'nozzle controlling device. The nozzle is controlled so that the desired velocity of the steam and the desired draft are obtainable at all times and the adjustment is made without any special attention from the engineer or fireman. The device is quite simple and can be easily and quickly installed on standard locomotives with very little change therein. The device has been amply demonstrated in actual practice and found to be very successful and efficient.

It will, of course, be understood that vari- Y ous changes may be made in the form, details,

arrangement and proportions-of the parts,

without departing from the scope of applicants invention, which, generally stated, consists in a device capable of carrying out the objects above set forth, in the novel parts and combinations of parts disclosedfand defined in the appended claims.

Y Vhat is claimed is 1. In a locomotive structure, an exhaust nozzle, a circular plate disposed'at the upper portion of said nozzle, a rod passing centrally across said' plate and secured thereto,- being journaled in the sides of said nozzle, gear meansat the outer side of said nozzle for oscillating said member, and means' connected 

